Theftproof light bulb



"Feb 20, l934- v. LEVEILLE THEFTPROOF LIGHT BULB Filed Sept. 20, 1953 Vazen@ WZZZQINVENTOR ATTOR N EY Patented Feb. 20,l 1934 UNITED STATES PATENT OFFICE Application September' 20, 1933 Serial No. 690,253

3 Claims.

'I'his invention relates to theft-proof electric light bulbs and has for the primary object the provision-of a device of the above stated character which will automatically lock itself 5 into an electrical output when applied to the latter and may not be removed therefrom without the destruction of' the light bulb and after the life of the light bulb and the destruction thereof the base of the latter may be easily and l quickly removed from the electrical output.

With these and other objects in view this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and II claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is .a vertical sectional view illusl0 trating an electric light bulb illustrating my invention. 'l

Figure 2 is a side elevation illustrating the same.

Figure 3 is a sectional view illustrating an l' attaching ferrule.

Figure 4 isv a fragmentary vertical sectional view showing the base of the bulb released from the ferrule.

Figure 5 is a sectional view taken on the line 5'-5 of Figure 1.

Figure 6 is a sectional view taken on the line 6 6 of Figure 3. c

Referring in detail tothe drawing, the nua meral 1 indicates the base of an electric light bulb and which carries the glass body 2 hermetically sealed-to permit the retaining of a vacuum within the body. The neck-.or end of the body connectedtothe base 1 has' formed integrally therewith a hollow post 3 extending 0 centrally through the body and terminating in a tip 4 formed on the body 2. The post supports a lament 5 and the latter' isrconnected to the electrical leads 6, oneoi which connects to a contact 7 carriedby the base 1 while the 5 other lead connects to a metal sleevel 8 surrounding the base 1. Mounted within the post 3 is a flexible member 9, one end of which terminates in the tip 4 in the form of a head l0, while the other end is connectedto di-V o verging locking members l1 operating in grooves 12 formed in the basel. The locking elements l1 extend through openings in the sleeve 8 to engage in a groove 13 of a sleeve 14 mounted within an electrical output. The base is inerred m' the sleeve 14 mm1 the elements 11 enter the groove 13 and when in engagement with the walls of the latter, the base is then locked to the sleeve. The sleeve is threaded so that it may be turned into an electrical output by a suitable tool engaging a projection l5 lying in the groove. After turning the sleeve home in the electrical output, the projection 15 is broken oli?, thereby removing the means of obtaining a grip on the sleeve for the purpose of turning the same out of the electrical output. l

After the life of the bulb has terminated, the tip 14 is broken off and a pull upon the element 9 disengages the locking elements 11 from the grooves whence the base may be removed from the sleeve.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of my invention, as claimed.

Having described the invention, I claim:

1. An electrical light bulb comprising a base, a transparent and breakable body carried by the base, locking elements carried by the base to engage a keeper of an electrical output, a hollow filament supporting post in the body and carried by the base, and means located within the post and connected to the locking elements for extracting them from the keeper after the destruction of the body.

2. An electrical light bulb comprising a base, a destructible body carried by said base, a hollow filament post located in the body and carried'by the base, locking elements carried by the base and extending into the post, a tip on the body and receiving one end of the post, and a member connected to the locking elements and extending through the post into the tip.

3. An electrical light bulb comprising a base, a destructible body carried by said base, a hollow filament post located in the body and car- Tied by the base, locking elements carried by the base 'and extending into the post, a tip on the body and receiving one end of the post, a member connected to the locking elements and extending through the post into the tip, a sleeve to receive the base and having a groove to recelve the locking elements and connectible with an electrical output against removal until the base has been removed from said sleeve.

VALERE LEVEILLE. 

